Grinding and mixing pan



' 1931- w. E. M MURRAY GRINDING AND MIXING PAN Filed Oct. 1OI 1928 (June W501 WITNESS am Patented May 19, 193i UNITED STATES PATENT o FicE WALTER E. MCMURRAY, OF CLEARFIELD, PENNSYLVANIA, ASSIGNOR TO OLEARFIELD MACHINE COMPANY, OF OLEAEYFI ELD, PENNSYLVANIA, A CORPORATION OF PENN- l SYLVAN IA GRINDING AND MIXING PAN Application filed October 10, 1928. .Serial No. 311,484.

This invention relates more especially to grinding and mixing machines of the type commonly known as wet pans and has for its primary object to provide an improved construction and arrangement of the parts whereby the operation of a machine of this character may be rendered more efiectlve 1n breaking up the material and in preventing the material from the pan.

. One of the objects of my inventlon is to packing and adhering to provide means of improved construction for bers of a main frame to eliminate the necessity for using'the tie rods or cross bracing commonly employed in machines of this type.

Another purpose, contemplated by the present inventionyis the substitution of completely closed bearings for the open guide bearings which are commonly arranged in the end frames. A further purpose is to arrange the muller-roll bearing entirely within the muller-roll and thus to provide agreat- 1y simplified construction which makes it unnecessary to mount the vmullers in swinging'arms pivotally supported from the sides of the machine. vThis construction inconsequence greatly facilitates the loading and unloading of the pan and at the same time gives free access tov the pan from opposite sides for other purposes; 2 p

Another object of my invention-is to provide an improved mount for a muller-roll which, by means of an eccentricrmovement of its rotary axis about the axis of the shaft, is adapted to provide a more gradual rise "of the muller-roll, under the displacement :of

grinding and mixing pan and provided with radial vanes which operate in an improved manner to cut into and break up the material and to convert it to a fluffy condition as it is delivered into the path of the muller-roll.

These and further objects of invention will appear in the appended claims in connection with the accompanying drawings which show a preferred embodiment of my invention.

In the drawings:

. Figure 1 is a side elevation and vertical section of a'wet pan rotary mill constructed in. accordance with the principles of my invention. g Y

Figure 2 is a top plan view of the same;

Figure 3 is a vertical section on the line 33of Figure 1. 1

Figure 4L is an enlarged side'elevation of the rotary scraper detached, parts being brokenaway and parts shown in section.

Referring mo're particularly to the drawings, according to the embodiment of my invention shown therein, a fixed frame which includes a base plate 1 and a centrally disposed pedestalQ, serves to mounta vertical shaft 3. As shownlin the drawings, the grinding or mixingpan comprises a rim portion 4 and acentral bottom plate 5 provided with a hub portion'6 which is journalled upon the upright shaft 8.,said hub portion 6 being rotatably supported'at the upper'end of the pedestal 2. An annular bevel gear'67 is driven by a bevel pinion 7 mounted on a drive shaft 8 which carries a belt pulley; 9 at its outer end. The drive shaft-8: is jour nalled at its inner end in a bracket-support 10 and in its outer end in an upright 11, said upright 11 being disposed diametricallyopposite to another upright 12 which is ar-' ranged on the opposite side of the vertical shaft 3. Surmounting the vertical shaft 3 is a bracket frame 13 provided with oppositely presented bearing arms which are coaxially aligned with bearings 14 mounted in the uprights 11 and 12. The vertical shaft 3, bracket-support 10, uprights 11 and 12, and bracket-frame 13 together with the baseplate 1 and pedestal 2, constitute the fixed frame of themachine. Mounted within the bearings 13 and 14 are stationary shafts 15 which in effect constitute with the bracket 13 a rigid tie between the end frames 11 and 12. Rotatably mounted on each of the stationary shafts 15 is an eccentric bearing block 16. Journalled upon the eccentric bearing block 16 by means of anti-friction rollers '17 is a muller-roll 18, said muller-roll being provided with an mterior bearing surface concentric to the central axis of the bearing block 16. Said bearing block 16 is provided at one end with a peripheral flange '19 which closes one end of the bore in muller-roll 18, the other end of said bore being closed by a bearing ring 20 mounted upon the cylindrical bearingv surface of the eccentric bearing block 16. It will be understood fromthis description that when material to be ground or mixed is-loaded into the rotary pan 4 it will be operated upon under a yielding pres sure due to the eccentric mounting of the muller-roll 18. Thus by referring to Figure 3, it will be seen that an accumulation of material to the right of the muller-roll 18 will have a tendency to displace said muller-roll toward the right and intobroken lineposition indicated in this figure. 'Thiseccentric yielding action of the muller-roll will be operative under less intense pressures than are required for a direct vertical lift of the mid ler-roll and moreover the yielding tendency will be in a directionaway from the oncoming material which is to be ground or mixed. As shown lIl F1gure2, the bracket support 13 is provided with a radial arm 21 in which is movably mounted one arm 22 of a scraper frame or support 23, the other arm 24 of said scraper frame being arranged to depend in any desired position towhich the frame 23'may be adjusted about the arm 22; A sleeve 25, which is ournalled freely upon the depending branch 24 of the scraper frame,

is provided above with an abutment collar 26 between which and a fixed abutment 27 is arranged a compression spring 28. The collar 27 may be adjusted axially of the branch 24 of the scraper frame for adjusting the pressure exerted by the spring 28 upon the rotary scraper. Secured to the lower end of sleeve 25 by means of radial pins 29 is a cylindrical head 30 provided with radial arms 31 which carry at their outer ends downwardly presented scraper blades 32 which are adapted to bear against the bottom plate 5 of the rotary pan. By an inspection of Figure 2, it will be seen that the rotary scraper is journalled upon a vertical axis which is eccentric to the rotary pan and adjustable relatively to the muller-roll about another axis which is also eccentric to the ro-' tary pan axis.

1. In a rotary mill of the character described, the combination with a rotary pan,

of a roll-supporting shaft, a bearing blockv 'movableeccentrically about the axis of said shaft, and a roll'journalled on said bearing block and rotatable about an axis" eccentric to the axis of said roll-supporting shaft.

2. In a rotary mill of the character described, the combination with a rotary pan, of a fixed radial shaft, a bearing block movable around said shaft and provided with a cylindrical bearing surface eccentric to the axis of said shaft, and a roll journalled' on said bearing surface being movable about an axis eccentric to the rotary. axis of said roll.

3. In a rotary mill of the character described, the combination of a fixed vertical shaft, a fixed horizontal shaft extending away from said fixed vertical shaft, a rotary mixing and grinding pan coaxial with said vertical shaft, a'muller-roll operating in said mixing and grinding pan, and a bearing block eccentrically mounted on said horizontal shaft and rotatably mounting said muller-roll on an axis eccentric to the axis of said horizontal shaft.

4. In a rotary mill of the character described, the combination with a rotary mixing and grindingpamof a rigidly mounted shaft extending radially of said rotary. mixing and grinding pan, a muller-roll operating in'said mixing and grinding pan on an axis eccentric to the axis of said 'rigidlys mounted shaft, and abearing block movable eccentrically about the axis of said rigidlymounted shaft; and having said roll freely journalled thereon.

5. In a rotary mill, the combination of a grinding pan, a muller-roll operatingtherein, a radial arm movable-about an axis and provided with a depending branch, and a rotary scraper head journalled. upon said de-' pending branch of the radial arm and pro vi'ded with downwardly-presented scraper blades. r 5 I V -6. In a rotary mill, the combination of a rotarypan, a muller-roll operating therein,

a fixed support, a radial arm movable about an axis eccentric mule rotary axis of said pan, said radial arm beingprovided with an inner branch pivotally mounted in said rotary sleeve journalled upon said depend-- ing outer branch, a scraper head secured to the lower end of said rotary sleeve andcomprising radial scraper arms, a fixed collar mounted on the depending outer branch of said radial arm above said sleeve, and a compression spring interposed between said fixed collar and the upper end of said sleeve.

8. In a rotary mill, the combination of a rotary pan, a muller-roll operating therein, a

fixed support, a radial arm movable about an axis eccentric to the rotary axis of said pan, said radial arm being provided with an inner branch pivotally mounted in said fixed sup port and a depending outer branch, a rotary sleeve journalled upon said depending outer branch, a scraper head secured to the lower end of said rotary sleeve and comprising radial arms provided at their outer ends with downwardly-presented scraper blades, an adjustable fixed collar on the vdepending outer branch of said radial arm, and a compression spring interposed between said fixed collar and the upper end of said sleeve.

9. In a rotary mill of the character described, the combination with a centrally disposed pedestal, of a rotary pan rotatably supported by said pedestal, an upright arranged outside of the periphery of said rotary pan, a horizontal shaft supported at its inner end by said pedestal and at its outer end by said upright, an eccentrically mounted bearing block movable freely about the axis of said horizontal shaft, and a roll journalled on said bearing block.

10. In a rotary mill of the character described, the combination of a centrally disposed pedestal, spaced uprights on opposite sides of said pedestal, a rotary pan rotatably mounted on said pedestal, horizontal shafts mounted at their inner ends on said pedestal and at their outer ends on said spaced uprights respectively, eccentrically mounted bearing blocks movable freely around said horizontal shafts, and rolls journalled on said bearing blocks.

11. 1n a rotary mill of the character described, the combination of a centrally disposed pedestal, spaced uprights on opposite sides of said pedestal, an upwardly-presented shaft mounted in said pedestal, a rotary pan journalled on said shaft and rotatably supported by said pedestal, a top bracket, a bearing surmounting said shaft, fixed horizontal shafts mounted at their inner ends in said top bracket and at their outer ends in said spaced uprights respectively, bearing blocks revolvable eccentri cally on said horizontal shafts, said bearing blocks being provided with'bearing surfaces eccentric to said shafts, and rolls journalled on said bearing'su'r'faces.

12. Ina rotary mill of the character de-j scribed,the combination with a main frame comprising a bed plate, a centrally disposed pedestal mounted on said bed plate, spaced, uprights on opposite'sides of said pedestal,

an upwardly-presented shaft mounted in said pedestal, a bearing bracket surmounting said shaft, coaxial horizontal shafts mounted at their inner ends in said bearing bracket and at their outer ends in said spaced uprights respectively, of a rotary pan journalled on said shaft and rotatably supported by said pedestal, a power shaft journalled in one of said spaced uprights and geared to said rotary pan, eccentrically mounted bearing blocks movable freely about the common axis of said horizontal shafts, and rolls journalled on said bearing blocks.

13. In a rotary mill, a rotary pan, a roll operating in said rotary pan, said roll being journalled on an axis movable about and in v parallelism with a second axis and a rotary scraper journalled upon a vertical axis and provided with radially-presented scraper of said roll.

blades for propelling materials into the path tary pan journalled on said shaft and sup-\- portedby said'pedestal, a roll operating in said rotary pan, a rotary scraper journalled upon a vertical axis, and ,a journalling support for said rotary scraper adjustable about an axis eccentric to the axis of said upwardlypresen'ted shaft.

16. In a grinding mill, the combination.

with agrinding pan, of a roll operating in said grinding pan, and a bearing block upon which said roll is concentrically journalled, said bearing block being oscillatably suspended from an axis eccentric to, the journalling axis of said bearing block; said axis being arranged in the same vertical plane in the lowermost position of said roll.

17. In a grinding mill, the combination with a grinding pan, of a roll operating'in said grinding pan, a horizontal supporting shaft arranged above and extending radially of said grinding pan, and a bearing block upon which said roll is concentrically journalled, said bearing'block being oscillatably suspended from said horizontal supporting shaft. V

18. In a grinding mill, the combination in a rotary mill, arotary pan, a roll op-.

with a fixed frame,"of a grinding pan mount ed ona vertical axis by said fixed frame, a

roll operating in said grinding pan, a scrapersupport mounted on said fixed frame and 5 having an arm depending into said grinding pan, a sleeve j ournalled upon said depending arm, and a plurality of radial scraper blades mounted on the lower end of said sleeve and in operating engagement with the bottomof said grinding pan.

19. In a grinding mill, the combination with a grinding pan and a'roll operating therein, of a scraper-supporting arm depending into said grinding pan, said scraper-supporting arm being arrangedon an axis eccentric to the axis of said grinding pan, a sleeve journalled upon said scrapensupport, a fixed collar mounted on said scraper-supporting arm above the upper end of said sleeve, a compression spring interposed: between said collar and said sleeve, and a scraper blade mounted radially on the lower end of said sleeve and presented downwardly against the bottom wall of said grinding pan and adapt- 5' ed by frictional engagement therewith to be revolved with and about the axis of said sleeve.

20. In a rotary grinding mill, the combination of a grinding and mixing pan rotatable so on a fixed vertical axis, fixed uprights oppositely arranged with respect to said fixed verical axis, a rigid connection between said uprights, and amuller roll rotatably supported by said rigid connection on an axis movable eccentrically with respect to the axis of said rigid connection.

21. In a rotary grinding mill, the combination of a rigid frame provided with oppositely arranged uprights, a fixed vertical 0' shaft mounted in said rigid frame between saiduprights, a grinding and mixing pan journaled upon said vertical shaft, means rigidly connecting said fixed vertical shaft and oppositely arranged uprights, and a muller roll arranged between said fixed vertical shaft and each of said uprights, said muller roll being provided with a journalling support carried by said rigid connecting means, said journalling support being movable eccentrically on said rigid connection means with respect to the rotary axis of said muller roll.

WALTER E. MCMURRAY. 

